docs: add feature list.

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

README.md

@@ -4,3 +4,16 @@
 [![codecov](https://codecov.io/gh/appleboy/queue/branch/master/graph/badge.svg?token=V8A1WA0P5E)](https://codecov.io/gh/appleboy/queue)
 
 Queue is a Golang library for spawning and managing a Goroutine pool, Alloowing you to create multiple worker according to limit CPU number of machine.
+
+## Features
+
+* [x] Support [buffered channel](https://gobyexample.com/channel-buffering) queue.
+* [x] Support [NSQ](https://nsq.io/) (A realtime distributed messaging platform)
+
+## Installation
+
+```sh
+go get github.com/appleboy/queue
+```
+
+## Usage